CN101504283A - Detection method for pipe diameter of underground non-metal pipe - Google Patents
Detection method for pipe diameter of underground non-metal pipe Download PDFInfo
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- CN101504283A CN101504283A CNA2009100378955A CN200910037895A CN101504283A CN 101504283 A CN101504283 A CN 101504283A CN A2009100378955 A CNA2009100378955 A CN A2009100378955A CN 200910037895 A CN200910037895 A CN 200910037895A CN 101504283 A CN101504283 A CN 101504283A
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Abstract
The invention relates to a method for detecting the pipe diameter of an underground nonmetallic pipe, which fully utilizes the time spacing between times of reflected waves of radar transmitting electromagnetic waves. The method comprises: using geological radar to detect and acquire times of reflected waves of the underground nonmetallic pipe; reading the reflection time of the times of reflected waves of the geological radar on a radar host in turn; and solving the pipe diameter of the pipe according to the arithmetic expression and the characteristic of the time spacing between the reflected waves. The method has the advantages of high economic benefit, high detection precision and wide use range.
Description
Technical field
The present invention relates to the detection method of underground non-metal caliber, specifically is that the applied geology radar is realized the detection to underground nonmetallic pipe caliber.
Background technology
In the acceptance survey work of underground utilities, the caliber of pipeline is a very important attribute.Because in urban road, pipeline not only quantity is huge, and the distribution of pipeline and arrange intricate.To accurately distinguish various pipelines, unlikelyly cause erroneous judgement, will grasp the unusual attribute of actual measurement pipeline as far as possible fully.This wherein caliber be a very important attribute.Such as, the original diameter of the pipeline that has is 100mm, become 200mm after the transformation, do not remove and old pipeline is only discarded, can find two pipelines simultaneously when surveying, except the caliber difference of pipeline, other attributes of these two pipelines are all identical, at this time, the size of detection caliber just becomes the important evidence of distinguishing two pipelines.
At present, geological radar is able to widespread use in underground utilities are surveyed, and has technically obtained great progress.But all the time, geological radar just is used for surveying the position and the buried depth of underground utilities basically, for the caliber of pipeline, all is to utilize given data or excavation evidence obtaining basically.Sometimes also can utilize the width of radar wave that caliber is estimated, but that its error of such way tends to is very big, technology is very immature.
Summary of the invention
For addressing the above problem, the invention discloses a kind of detection method of underground non-metal caliber, the applied geology radar carries out line to underground nonmetallic pipe and surveys, by the electromagnetic repeatedly computing of walking time interval between the reflection wave, realize accurate detection to the pipeline caliber to the geology radar emission.
The geological radar exploration is a kind of geophysical prospecting method based on the difference in dielectric constant of underground different medium.Show that as Fig. 1 to the pulse of underground emission high-frequency electromagnetic, this pulse can produce reflection wave when running into the change in dielectric constant interface on object in the stratum and stratum in the underground propagation process by emitting antenna for it.Reflection wave is propagated back to and is received antenna behind the face of land and receives, and import it into main frame and write down and show, each measuring point receives electromagnetic waveforms one, article one, the electromagnetic waveforms of whole measuring points is arranged in together on the survey line, form complete radar section, through the aftertreatment of data, just carry out the parameters such as position, distribution range, buried depth that inversion interpretation can obtain subsurface formations (as surface layer, cement stabilizing layer) or underground object (as underground utilities, cavity, reinforcing bar, canal case etc.).
Therefore as shown in Figure 2, be the principle of geologic radar detection pipeline: during the downward launching electromagnetic wave of radar antenna, have certain side angle, when antenna and no show pipeline top side, the electromagnetic wave of its emission " shifts to an earlier date " and detects pipeline.As shown in Figure 2: when radar antenna moved to the A point, its electromagnetic wave was emitted to pipe and goes up A ' point, reflexes to radar antenna, and the distance of its operation is 2AA ', and be 2AA '/V working time
C soil, V wherein
C soilBeing electromagnetic wave travelling speed in the native medium, on the radar record time cross-section, is 2AA '/V in the A following time of point correspondingly just like this
C soilRadar return appears in the place, and when native medium evenly the time, the distance of its demonstration is exactly AA ', i.e. A under A point " put reflection wave, AA appear "=AA '.Several points that so occur as: A " B " C " D ", the arc reflection wave of Xing Chenging promptly is the radar reflection wave mode of pipeline like this.
Its repeatedly reflection wave formation as shown in Figure 3: when electromagnetic wave is emitted to pipe and goes up A ' point, two components that it can be decomposed into pipeline tangential direction A ' E and point to center of circle O (direction is A ' O) perpendicular to tangential direction, electromagnetic wave along A ' E direction continues to propagate downwards, Electromgnetically-transparent along A ' O direction is gone in the pipeline, propagate through center of circle arrival pipeline millet cake F point through pipeline internal medium, meet tube wall and produce reflection again, directly be back to A ' point along FA ' direction, produce reflection and transmission at A ' some place, transmitted wave direction wherein is along A ' F ', it is along the component of A ' A direction, being back to radar antenna is that radar receives, the radar secondary reflection ripple of Here it is pipeline, the path of its operation is 2AA '+2A ' F, the time of operation is 2AA '/V
C soil+ 2A ' F/Vc, wherein V
C soilBe electromagnetic wave travelling speed in the native medium, and Vc is the electromagnetic wave travelling speed of pipeline medium.When the pipeline medium was water, its velocity of wave was about 1/3 of native medium.Therefore, the radar secondary reflection ripple of the underground non-metal pipeline position that can occur should be at Mintrop wave A " 2A ' F/Vc place is equivalent to 6A ' F/V under the point
C soil, promptly can appear at Mintrop wave A " the following A of 3d (pipe diameter) of point " " position, but not the Mintrop wave A of people's imagination " the some A ' ' ' position of d (pipe diameter) down, to such an extent as to people can be considered as it irrelevant interference by mistake.Like this, radar is gone in the pipeline at the Electromgnetically-transparent of A ' O direction, propagates through the center of circle through pipeline internal medium and arrives pipeline to millet cake F point, meets tube wall and produces reflection again, directly be back to A ' some formation reflection wave again again, so form reflection wave repeatedly along FA ' direction.Thereby repeatedly walk time interval between the reflection wave according to above-mentioned radar emission is electromagnetic, by rational collecting method and computing, can accurately survey the caliber of underground non-metal line.
For realizing purpose of the present invention, a kind of detection method of underground non-metal caliber, the detection method of described underground non-metal caliber adopts geological radar, it is characterized in that, and underground non-metal is in the state of the medium that is full of low velocity of wave high-k; Angle between the vertical direction of the electromagnetic wave of the transmission antennas transmit of described geological radar and described underground non-metal pipeline is α, and 0 °≤α≤45 °, and the step of the detection method of described underground non-metal caliber is:
A. use geologic radar detection to take the repeatedly reflection wave of underground non-metal pipeline, its concrete steps are: select to survey profile position, the geological radar section is perpendicular to the trend of underground non-metal pipeline, and it is smooth that the ground of geological radar section keeps; Select the frequency of geological radar antenna; Connect main frame, antenna and power supply, acquisition parameter is set after opening the geological radar main frame; Promote the geological radar car, gather the geological radar section, obtain repeatedly geological radar reflection wave;
B. on radar host computer, read repeatedly T during the reflecting away of reflection wave of geological radar successively
1, T
2, T
3T
4
C. ask for the caliber of pipeline by arithmetic expression, described arithmetic expression is:
D＝Vc×∑(T
i+1-T
i)/2(n-1)，
In described arithmetic expression: Vc is the velocity of electromagnetic wave of the medium of described low velocity of wave high-k, and unit is m/ns; T
I+1, T
iWhen being the walking of adjacent up and down reflection wave, unit is ns; N is the geological radar wave reflection total degree that detects.
As improvement, in described step a, when selecting the frequency of geological radar antenna, the antenna frequencies of selecting when surveying the depth of burying greater than the underground non-metal pipeline of 3m is 100MHz; Surveying the depth of burying is 200MHz, 400MHz or 600MHz in the antenna frequencies that 3m selects during with interior underground non-metal pipeline.
As improvement, in described step a, when acquisition parameter is set: the time window be chosen as 80～150ns; Select automatic gain to transfer and establish detecting parameter, automatic gain is transferred when establishing, and geological radar antenna is passed through directly over underground non-metal pipeline; Range finding wheel parameter is selected, and sampling interval must not be greater than 0.1m.
As improvement, in described step a, obtain repeatedly the geological radar ripple after, if the data of gathering are undesirable, transfer again and establish gain: as overflow, then allow antenna through reflection the most doughtily section gain and reset; As signal excessively a little less than, then allow antenna gain and reset through the most weak location of reflection.
As improvement, in described step a,, the geological radar section is surveyed to the parallel row that moves again in both sides if still can not effectively survey after gain established in accent again.
As improvement, the medium of described low velocity of wave high-k is a water, in described arithmetic expression, and Vc
Water=0.033m/ns.
Compared with prior art, the present invention has made full use of that radar emission is electromagnetic repeatedly walks time interval between the reflection wave, changed in the past when underground nonmetallic pipe line reflection multiple reflection occurs unusually, just be left in the basket always, even much thought the detection method of interference wave.In addition, the present invention is according to the detection method that time interval is designed a kind of brand-new underground non-metal caliber of walking between between multiple reflection reflection, and its beneficial effect is:
(I) promoted the use value and the detectivity of geological radar, changed geological radar and can only survey the position of underground utilities and the present situation of buried depth;
(II) have great economic benefit, utilized given data or excavation evidence obtaining to waste time and energy in the past, and expend greatlyyer, the present invention has saved a large amount of detection costs utilizing the purpose that can realize sound-pipe spool footpath under the situation at non-excavation of existing equipment;
(III) detection accuracy height, deviation range is minimum, can help the accurately underground different pipeline of identification of detection personnel in conjunction with the information such as buried and position of pipeline.
(IV) usable range is extensive, can be applied to the detection of multiple underground non-metal caliber.
Description of drawings
Fig. 1 is radar ultimate principle thoroughly;
Fig. 2 is that the radar return of pipeline forms principle schematic;
Fig. 3 is the formation principle schematic of the radar reflection multiple reflection of pipeline;
Fig. 4 is the first radar reflection image of first plastic tube;
Fig. 5 is the second radar reflection image of first plastic tube;
Fig. 6 is the first radar reflection image of second plastic tube;
Fig. 7 is the second radar reflection image of second plastic tube;
Fig. 8 is the first radar reflection image of glass reinforced plastic pipe;
Fig. 9 is the second radar reflection image of glass reinforced plastic pipe;
Figure 10 is the 3rd a radar reflection image of glass reinforced plastic pipe.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment one
Extremely shown in Figure 7 as Fig. 4, one the street is numbered in the underground nonmetal feed pipe final acceptance of construction of 07J3345 in south, Dabu, Guangzhou, two underground nonmetal feed pipes to be respectively first plastic tube and the caliber that caliber is 0.1m be second plastic tube of 0.15m, described two underground nonmetal feed pipes are in the state of water supply; Angle between the electromagnetic wave of the transmission antennas transmit of geological radar and the vertical direction of described underground nonmetal feed pipe is α, and 0 °≤α≤45 °, and its detection steps is:
A. use geologic radar detection to take the repeatedly reflection wave of underground non-metal pipeline.At first, the correct selection surveyed profile position: the radar section will be perpendicular to the trend of pipeline, and it is smooth that the ground of radar section will keep, and does not have interference such as well lid, iron block, electric wire, section not to be laid in the hi-line below on the section; Secondly, correctly select radar antenna, the range of choice of antenna frequencies is 100MHz～600MHz: survey and select the 100MHz antenna when being embedded in the following pipeline of 3m, when investigation depth is selected 200MHz, 400MHz or 600MHz during with interior pipeline at 3m; Again and, connect main frame, antenna, power supply, open radar host computer, in main frame, start the K2 function software, acquisition parameter correctly is set: window is chosen as 80～150ns when (1), must not be greater than 150ns; (2) select " automatic gain " to transfer and establish detecting parameter, when the automatic gain accent is established, should allow radar antenna directly over pipeline, pass through; (3) range finding wheel parameter is selected: sampling interval must not be greater than 0.1m; At last, promote radar truck, gather the radar section in the present embodiment and surpass 50, obtain as Fig. 5 to repeatedly geological radar ripple shown in Figure 8.
B. on radar host computer, open the K2 program, check the radar waveform figure that has gathered, read T
1, T
2, T
3T
i
C. according to arithmetic expression D=Vc
Water* ∑ (T
I+1-T
iCalculate)/2 (n-1), wherein Vc
WaterBe the velocity of electromagnetic wave of water, Vc
Water=0.033m/ns; The PIPE DIAMETER CALCULATION value of first plastic tube is 0.033 * (30.2-12.2)/6=0.1m among Fig. 5, and error is 0; The first plastic tube PIPE DIAMETER CALCULATION value is 0.033 * (30.6-13.2)/6=0.097m among Fig. 6, and error is 0.003m, and relative error is 3%; The second plastic tube PIPE DIAMETER CALCULATION value is 0.033 * (44.0-6.4)/8=0.155m among Fig. 7, and error is 0.005m, and relative error is 3.33%; The second plastic tube PIPE DIAMETER CALCULATION value is 0.033 * (46.2-17.6)/6=0.157m among Fig. 8, and error is 0.007m, and relative error is 4.67%.
Wherein in above-mentioned steps a, if the data of gathering are undesirable, select following method to repeat to survey: I, transfer and establish gain again, as overflow then allow antenna through reflection the most doughtily section gain and reset, then allow antenna gain a little less than crossing as signal and reset through the most weak location of reflection; II, still can not effectively survey as the I method, the radar section can be moved to both sides are parallel, row is surveyed again.
Embodiment two
As shown in Figure 8, when surveying a underground non-metal on Xi Wan road, Guangzhou, this underground non-metal is that caliber is the glass reinforced plastic pipe of 0.6m, and described glass reinforced plastic pipe is in the state of water supply; Angle between the electromagnetic wave of the transmission antennas transmit of geological radar and the vertical direction of described glass reinforced plastic pipe is α, and 0 °≤α≤45 °, and its detection steps is:
A. use geologic radar detection to take the repeatedly reflection wave of described underground GRP pipe.At first, the correct selection surveyed profile position: the radar section will be perpendicular to the trend of pipeline, and it is smooth that the ground of radar section will keep, and does not have interference such as well lid, iron block, electric wire, section not to be laid in the hi-line below on the section; Secondly, correctly select radar antenna, the range of choice of antenna frequencies is 100MHz～600MHz: survey and select the 100MHz antenna when being embedded in the following pipeline of 3m, when investigation depth is selected 200MHz, 400MHz or 600MHz during with interior pipeline at 3m; Again and, connect main frame, antenna, power supply, open radar host computer, in main frame, start the K2 function software, acquisition parameter correctly is set: window is chosen as 80～150ns when (1), must not be greater than 150ns; (2) select " automatic gain " to transfer and establish detecting parameter, when the automatic gain accent is established, should allow radar antenna directly over pipeline, pass through; (3) range finding wheel parameter is selected: sampling interval must not be greater than 0.1m; At last, promote radar truck, gather the radar section, obtain repeatedly geological radar ripple as shown in Figure 9.
B. on radar host computer, open the K2 program, check the radar waveform figure that has gathered, read T
1, T
2, T
3T
i
C. according to arithmetic expression D=Vc
Water* ∑ (T
I+1-T
iCalculate)/2 (n-1), wherein Vc
WaterBe the velocity of electromagnetic wave of water, Vc
Water=0.033m/ns; The PIPE DIAMETER CALCULATION value is 0.033 * (60.0-24.6)/2=0.584m among Fig. 8, and error is 0.016m, and relative error is 2.67%; The PIPE DIAMETER CALCULATION value is 0.033 * (67.8-31.2)/2=0.604m among Fig. 9, and error is 0.004m, and relative error is 0.67%; The PIPE DIAMETER CALCULATION value is 0.033 * (65.6-28.8)/2=0.607m among Figure 10; Error is 0.007m, and relative error is 1.17%.The material of GRP pipe, actual caliber are all examined through driving a well in the present embodiment.
Wherein in above-mentioned steps a, if the data of gathering are undesirable, select following method to repeat to survey: I, transfer and establish gain again, as overflow then allow antenna through reflection the most doughtily section gain and reset, then allow antenna gain a little less than crossing as signal and reset through the most weak location of reflection; II, still can not effectively survey as the I method, the radar section can be moved to both sides are parallel, row is surveyed again.
Claims (6)
1, a kind of detection method of underground non-metal caliber, the detection method of described underground non-metal caliber adopts geological radar, it is characterized in that, and underground non-metal is in the state of the medium that is full of low velocity of wave high-k; Angle between the vertical direction of the electromagnetic wave of the transmission antennas transmit of described geological radar and described underground non-metal pipeline is α, and 0 °≤α≤45 °, and the step of the detection method of described underground non-metal caliber is:
A. use geologic radar detection to take the repeatedly reflection wave of underground non-metal pipeline, its concrete steps are: select to survey profile position, the geological radar section is perpendicular to the trend of underground non-metal pipeline, and it is smooth that the ground of geological radar section keeps; Select the frequency of geological radar antenna; Connect main frame, antenna and power supply, acquisition parameter is set after opening the geological radar main frame; Promote the geological radar car, gather the geological radar section, obtain repeatedly geological radar ripple;
B. on radar host computer, read repeatedly T during the reflecting away of reflection wave of geological radar successively
1, T
2, T
3T
i
C. ask for the caliber of pipeline by arithmetic expression, described arithmetic expression is:
D＝Vc×∑(T
i+1-T
i)/2(n-1)，
In described arithmetic expression: Vc is the velocity of electromagnetic wave of the medium of described low velocity of wave high-k, and unit is m/ns; T
I+1, T
iWhen being the walking of adjacent up and down reflection wave, unit is ns; N is the geological radar wave reflection total degree that detects.
2, the detection method of underground non-metal caliber according to claim 1, it is characterized in that: in described step a, when selecting the frequency of geological radar antenna, the antenna frequencies of selecting when surveying the depth of burying greater than the underground non-metal pipeline of 3m is 100MHz; Surveying the depth of burying is 200MHz, 400MHz or 600MHz in the antenna frequencies that 3m selects during with interior underground non-metal pipeline.
3, the detection method of underground non-metal caliber according to claim 2 is characterized in that: in described step a, when acquisition parameter is set: the time window be chosen as 80～150ns; Select automatic gain to transfer and establish detecting parameter, automatic gain is transferred when establishing, and geological radar antenna is passed through directly over underground non-metal pipeline; Range finding wheel parameter is selected, and sampling interval must not be greater than 0.1m.
4, the detection method of underground non-metal caliber according to claim 3, it is characterized in that: in described step a, after obtaining repeatedly the geological radar ripple, if the data of gathering are undesirable, again transfer and establish gain: as overflow, then allow antenna through reflection the most doughtily section gain and reset; As signal excessively a little less than, then allow antenna gain and reset through the most weak location of reflection.
5, the detection method of underground non-metal caliber according to claim 4 is characterized in that: in described step a, if still can not effectively survey after gain established in accent again, the geological radar section is surveyed to the parallel row that moves again in both sides.
6, according to the detection method of described any one underground non-metal caliber of claim 1 to 5, it is characterized in that: the medium of described low velocity of wave high-k is a water, in described arithmetic expression, and Vc
Water=0.033m/ns.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353980A (en) * | 2011-09-30 | 2012-02-15 | 铁道第三勘察设计院集团有限公司 | Equidistant three-point seismic prospecting method for detecting deeply-buried nonmetallic pipeline |
| CN103675922A (en) * | 2013-12-13 | 2014-03-26 | 南京工业大学 | Operation period underground pipeline pipe diameter measuring method based on ground penetrating radar |
| CN104020495A (en) * | 2014-06-24 | 2014-09-03 | 中国矿业大学(北京) | Automatic underground pipeline parameter recognizing method on basis of ground penetrating radar |
| CN107677197A (en) * | 2017-09-19 | 2018-02-09 | 贵州电网有限责任公司 | A kind of volume measurement device and measuring method of buried target body |
| CN108680137A (en) * | 2018-04-24 | 2018-10-19 | 天津职业技术师范大学 | Earth subsidence detection method and detection device based on unmanned plane and Ground Penetrating Radar |
| CN109239788A (en) * | 2018-11-14 | 2019-01-18 | 广州瑾诚测绘有限公司 | A kind of detection method and device of pipe diameter of underground non-metal pipe |
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2009
- 2009-03-16 CN CN2009100378955A patent/CN101504283B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353980A (en) * | 2011-09-30 | 2012-02-15 | 铁道第三勘察设计院集团有限公司 | Equidistant three-point seismic prospecting method for detecting deeply-buried nonmetallic pipeline |
| CN102353980B (en) * | 2011-09-30 | 2013-04-17 | 铁道第三勘察设计院集团有限公司 | Equidistant three-point seismic prospecting method for detecting deeply-buried nonmetallic pipeline |
| CN103675922A (en) * | 2013-12-13 | 2014-03-26 | 南京工业大学 | Operation period underground pipeline pipe diameter measuring method based on ground penetrating radar |
| CN103675922B (en) * | 2013-12-13 | 2016-03-30 | 南京工业大学 | Based on the operation period underground pipeline pipe diameter assay method of ground penetrating radar |
| CN104020495A (en) * | 2014-06-24 | 2014-09-03 | 中国矿业大学(北京) | Automatic underground pipeline parameter recognizing method on basis of ground penetrating radar |
| CN104020495B (en) * | 2014-06-24 | 2015-05-06 | 中国矿业大学(北京) | Automatic underground pipeline parameter recognizing method on basis of ground penetrating radar |
| CN107677197A (en) * | 2017-09-19 | 2018-02-09 | 贵州电网有限责任公司 | A kind of volume measurement device and measuring method of buried target body |
| CN108680137A (en) * | 2018-04-24 | 2018-10-19 | 天津职业技术师范大学 | Earth subsidence detection method and detection device based on unmanned plane and Ground Penetrating Radar |
| CN109239788A (en) * | 2018-11-14 | 2019-01-18 | 广州瑾诚测绘有限公司 | A kind of detection method and device of pipe diameter of underground non-metal pipe |
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